<!DOCTYPE html>
<html>
  <head>
    <title>:root test</title>
    <style type="text/css">
      html      { background: green; }
    </style>
  </head>
  <body>
    The background of the page should be green and you should see not red at all.
    <p>And the background of this sentence should be green too.</p>
  </body>
</html>
